JPS6074977A - One-transistor type inverter - Google Patents

Abstract

PURPOSE:To reduce a switching loss of a main transistor by delaying the rise of the base current of the transistor to eliminate the ON of the transistor. CONSTITUTION:When an AC power source 1 is turned ON, a full-wave rectified output is generated from a full-wave rectifier 2, applied to an inverter 3, which is oscillated. However, in this inverter 3, the rise of the base current of a transistor 32 is delayed by a capacitor 71 until the voltage between the collector and the emitter of the transistor 32 crosses zero. Thus, the base current is supplied to the transistor 32 only in the zone after the voltage between the collector and the emitter crosses the zero to turn ON the transistor, thereby reducing the switching loss.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention (41, for example, 1 used in a discharge lamp lighting device)
Regarding Type 6 Y shiverter.

(Background of the Invention) FIG. 1 shows the circuit configuration of a discharge lamp lighting device using a conventional base feedback type single-stone inverter.
1 is an AC power source such as a commercial power source, a rectifier such as a full-wave rectifier circuit 2 is connected to the AC power source 1, and a one-method progging fast oscillation transistor inverter 3 is connected between the rectifier output terminals a and b of the rectifier circuit 2. Roughly speaking, a load is applied to the secondary winding 31s of the output transformer 31 of this inverter 3, (
A discharge lamp (lamp) 4 is connected. Reference numeral 5 designates a high frequency bypass (m:'), which is sometimes also used as a smoothing capacitor (j) in a continuous input type rectifier circuit.

The inverter 3 includes an output 1 to a lance 31, a main transistor 32, etc.
Output 1-
While connecting the primary winding 31p of the lance 31,
When the next winding 311] is connected to the IC row for resonance, the winding 33 is set to 1
The emitter of the transistor 32 is connected to the diode 34.
A diode 35 is connected between the collector of the transistor 32 and the negative output terminal (common terminal) b of the rectifier circuit 2 through the transistor 3
One end of the base return winding ζ of the output 1 to the lance 31 is connected to the negative side output of the rectifier circuit 2. Connect to one terminal 4
The other end is connected to capacitor 36 and inductor 3.
It is connected to the base of the 1-run transistor 32 via the LC series resonant circuit.

4, the diode 341: J)-° is intended to protect the raster 32 from reverse voltage between the base and the 1-mitter, and to supply 1j (instead of 7) to the base spreading lightning. be.

When the transistor 32 is off, the diode 35 is output by providing the primary winding 3ip of the output transformer 31 with a core flow path in the opposite direction to the small flow of the resistor 32. Tamper die to prevent waveform distortion
It is 1~゛.

Next, we will discuss the operation of the discharge lamp lighting device that has been constructed.

When the AC power source 1 is turned on, a high wave rectifier circuit 2 generates a high wave rectified current (pulsating current output), which is inputted to the inverter 3. As a result, in the inverter 3, the rectified output is applied as a base current to the run resistor 32 via the bias resistor 38, and the run resistor 32 is turned on. From now on, transistor 32 (well, transistor 32
Primary winding 31p of collector output transformer 31 - Base return 3r winding 31f - Condenser 3G - Inductor 37
-1 to the collector-base positive feedback loop consisting of the base of the transistor 32, etc., and the resonance of the inductance of the primary 5113ip and the capacitor 33, and the output 1 to
Each winding 31p of the lance 31.

Generates high frequency output at 31s and 3H. Lamp 4 (well,
The high frequency output 1] is obtained through the secondary winding 31s of the lance 31 and is lit.

By the way, the inverter 3 has high frequency switching characteristics by supplying a base current to the transistor 32 through a series circuit of a capacitor 36a5 and an inductor 37. In other words, the capacitor 36 and the inductor 37 constitute a series resonant circuit, and the main transistor 32 can be sufficiently driven by the 7F direction current.
A large base charge is extracted with a negative quotient current, and this base extraction current is caused by the action of the diode 34 to increase the current of +1 to transistor 32 at the instant of the main 1 to transistor turn A). Since the current becomes equal to the base extraction current, the current stops when the diode 34 is turned off, and excess or deficiency of J1' is prevented. However, such measures! +tt; ShiT t+1-1 ~ Switching loss of Runsista 32 (Also, I thought it was a bit of a culm and I hated it.

The name of the present invention, etc. (I conducted various studies regarding the cause of this problem, and the results are shown in the voltage and current waveform diagrams at various parts in Figure 2.)
1 to collector-emitter voltage of syndisk 32\lC
e and the voltage Vf of the return winding 31f of the output 1-lance 31 (, 1, the waveform (loss point) is the same, but the grass stalk potential (position of O level) n\ is different. Therefore, the collector-emitter type In the positive section before Et V ce reaches zero cross, bl1111 return 51"jl 'F4 pressure\/f is ze[]
After crossing and positive upper pressure etc. 4, a section [1 occurs where the base voltage l-1E of the Hernan transistor 32 becomes positive, and in this section, the transistor 32 becomes P-7fF; Pan K I
When b flows, the voltage VCe turns on regardless of whether it crosses 1 or not. Therefore, the energy of the resonant circuit of the output transformer 33 and the output transformer primary winding 31 is expended by the transistor 32, and the switching loss when the transistor 32 is turned on increases. Ta.

FIG. 3 shows the circuit configuration of a discharge lamp lighting device devised based on the above knowledge and previously filed as Japanese Patent Application No. 58-1.57945 by the present applicant. The device shown in the same figure is different from the one shown in FIG.
A 1-hylang resistor 61 as a switching element is connected between the base of the 1-hylang resistor 61σ) and the negative output terminal of the rectifier circuit 2.
The capacitor 6 is connected between the base side terminals of the return winding 31
3 are connected.

Note that the diode 62 is the same as the diode 34 for the transistor 32;
] - To protect from reverse voltage between the mitter σ) - C A2
).

In the inverter 3 a'3, the output voltage of the return winding 31f is differentiated by the capacitor 63 and the transistor 61
By applying it to the base of the l-ransistor 32, the base current (b) is applied to the l-ransistor 32 from just before (~runraster 3
2) The type R2 between the rector and the Omitter is zeroed by 1, and the base winding 31f output?
I'; During the interval 12 including the interval 11 where J'l is positive, the transistors 1 to 1 are turned on, and the base current 1b of the transistor 32 is bypassed. As a result, 1~
After the collector-emitter voltage Vce reaches zero, the base current is supplied to the run transistor 32 U, and -C is turned on only in the section 13, and the switching loss is reduced.

However, there is a problem in that a large number of additional parts (several pieces) are required to reduce the switching costs of the single-stone inverter.

(Objective of the Invention) The object of the present invention is to significantly reduce the switching loss (when turned off at L) of a base feedback type single-stone blocking inverter without increasing the number of components, and C is The aim is to improve the circuit efficiency and the reliability of the transistor.

(Part 4 of the invention) F. "In order to achieve the first objective, the present invention C has a primary winding and a feedback winding." The +C current is supplied from the 7th winding through the LC series resonant circuit.
The base-return single-stone blocking inverter for driving the bases of transistors 1 to 1 is characterized in that a series circuit consisting of a capacitor and a constant voltage element is connected between the base and emitter of the transistors.

Here, between the base and the U-mitter, each terminal of the Sugitsu 1-ring resistor is connected directly to the base and upper emitter of the main transistor, respectively, or in series with the base or emitter of the main transistor. Tie 'A-1~, resistor, inductor, ] capacitor through the circuit elements between C and I
It also includes the case where it is connected to.

(Explanation of Examples) The present invention will be described in detail below using the drawings.

Note that portions common or corresponding to those of the conventional example are represented by the same sleeve C.

FIG. 5 (U) A circuit configuration of a discharge lamp lighting device according to an embodiment of the present invention; I0! A capacitor 71 and a diode γ are connected between the base of 32 and the output terminal (common terminal) b of the rectifier circuit 2.
This is a series circuit consisting of 2 and 2 connected together. It should be noted that the base of the transistor 32 is connected to the gate A-door 2 in the direction 9 (L CllF! direction) and the diode 34 is connected in the same direction (h direction).

Next, the action of the position 'f:' in FIG. 5 will be explained while referring to the voltage/current waveform diagram at each part in FIG. 6.

When AC power supply 1]) 1 is turned on, a full-wave rectified output 'i (ilb'+output output) is generated from the full-wave rectifier circuit 2, and this is sent to the inverter 3 as LJ-c ii! In this case, the inverter 3 oscillates, a cylinder frequency output is generated, and the lamp 4 is ignited (16 at T).

However, in this inverter 3, the transistor 3
The rising edge of 2's current 111' + 1+ is connected to the T- of transistor 32. The inter-mold pressure Vce is delayed by a J:C capacitor 71 which is 10 times 1-1 times. In addition, the collector-emitter voltage ULVcc drops in the section after the I cross (13
) is only turned on when the base current is supplied and the switching port is reduced.

Note that the zener diode 72 is used for switching when the transistor 32 is turned off (in order to prevent an increase in J). Ransistor 32
The fall of the base current at turn-off becomes slow, and switching loss increases. On the other hand, if d3 is in front of the turn A of the first transistor 32, this jelly-tie-4-door 2 is in the forward direction with respect to the current of the second binary 71, so this old League I-72
1J, the influence of t- can be ignored.

Fig. 7 11 shows the construction of the discharge lamp lighting device according to the embodiment 11 (!) of the present invention. After removing the resistor 39 connected in parallel with -C, the output transformer 310 is connected to the base return of the base of the output transformer 310, and a winding terminal is connected to the winding part (31f). Transistor 391
The base of this transistor 391 is connected to the base of this transistor 391, and also connected to the base of this transistor 391 via a mink tie Δ-dead 392. During the operation of the inverter 3, the voltage across the base feedback line 31 becomes negative and the transistor 32 becomes 74 voltage. J: t') l-ranjisc3
91 is turned on, and when the transistor 32 is turned on, the capacitor 3G charged by the base current to the transistor 32 is discharged. +!
When the lightning H of the 4-wire 31f hits 11-Φ;, it becomes possible to supply the base current to the run transistor 32. In this way, by removing the resistors 39 for resetting the reset circuit 36 of the device shown in Box 5, the Q of the Ic resonant circuit decreases and the switching characteristics of the transistors 32 deteriorate due to this. Defense is 11-shi.

Note that this is limited to the embodiment of 4 (issued!!tl LSl, F book and small), and can be modified as appropriate without departing from the spirit of the present invention. For example, an inverter may be used. 3 is a so-called auxiliary power supply type in which a part of the output horn is rectified and stored in a capacitor, and the charged electricity is supplied to this inverter as auxiliary power while the rectified output of the rectifier circuit 2 is lower than the voltage of both capacitors. An inverter may also be used. In this case, the diode 35 can be omitted.

(Effects of the Invention) As described above, according to the present invention, the start-up of the base current to the transistor is delayed until the voltage between the collector and emitter of the main transistor of the inverter reaches zero. 1~Turn on nondisk 1! Since the main i-transistor's switching current is reduced, the circuit efficiency is improved. '; Is it important to reduce switching loss by 11 degrees?
11γ1 decreases, which is advantageous in terms of design, and f,
Yoritake is on the way” -ηru. Moreover, there are two additional parts: a capacitor ζδ and a zener diode.

Note that at turn-off, due to the action of the bald bouquet diode 72, transistors 1 to 32 are turned off first, and then capacitor 7 is turned off.
1 is reset, "" at turn Δ)
Su's 19 addition to 1? '! ＜、Nothing.

[Brief explanation of the drawing]

Figures 1 and 3 are circuit diagrams of the 1 lighting system using a conventional one-stone impark, and Figures 2a-3 and 4 are the circuit diagrams of the discharge lamp lighting equipment shown in Figures 1 and 3, respectively. Voltage or current waveform diagram of each part in the stomach, Fig. 5
! Circuit diagram of the discharge lamp production device according to the example, Fig. 6 + J, No. 5
Each j11 in the discharge lamp lighting device shown in the figure; voltage or current waveform diagram;
be. 1. Exchange city jD+! , 2... rectifier circuit, 3.
・R converter, 31... Output 1 to Lasis, 311...
・L\-S return) Mo winding, ((2...output transistor, 3G...2]n1b, 37...intertafter,
71...Kong Denri, 72-12 Nataia 1
-1',. Patent applicant: Toshiba Electric Corporation 4A Corporation (company representative) (2): I゛ri 1: Tatsu Ito, 1: Agent: Patent attorney: Tetsuya Ito

Claims (1)

[Claims] Comprising an output 1 having a primary winding and a feedback winding, and a main transistor that energizes the primary winding & is supplied from the feedback winding via an LC series resonant circuit. The base return helicopter drives the base of the main transistor by the current generated.
In the one-stone blocking inverter, a series circuit consisting of a constant voltage element having the same polarity diode characteristic, such as a capacitor, is connected between the base and emitter of the main transistor. A single-stone inverter that eliminates damage.